how to change an actor image depending on the position of the joystick

thanks hehehe forgive the question, how change an actor image depending on the position of the joystick, for example, I move the player to the left with the joystick, how can change the image when the joystick are it on left, and not have the same image, and vice versa on the right, change the image depending on teh position of the joystic???
thanks
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